CVE-2021-47142

In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu: Fix a use-after-free looks like we forget to set ttm->sg to
NULL. Hit panic below [ 1235.844104] general protection fault, probably for
non-canonical address 0x6b6b6b6b6b6b7b4b: 0000 [#1] SMP DEBUG_PAGEALLOC
NOPTI [ 1235.989074] Call Trace: [ 1235.991751] sg_free_table+0x17/0x20 [
1235.995667] amdgpu_ttm_backend_unbind.cold+0x4d/0xf7 [amdgpu] [
1236.002288] amdgpu_ttm_backend_destroy+0x29/0x130 [amdgpu] [ 1236.008464]
ttm_tt_destroy+0x1e/0x30 [ttm] [ 1236.013066]
ttm_bo_cleanup_memtype_use+0x51/0xa0 [ttm] [ 1236.018783]
ttm_bo_release+0x262/0xa50 [ttm] [ 1236.023547] ttm_bo_put+0x82/0xd0 [ttm]
[ 1236.027766] amdgpu_bo_unref+0x26/0x50 [amdgpu] [ 1236.032809]
amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x7aa/0xd90 [amdgpu] [ 1236.040400]
kfd_ioctl_alloc_memory_of_gpu+0xe2/0x330 [amdgpu] [ 1236.046912]
kfd_ioctl+0x463/0x690 [amdgpu]